MCQ On Biomolecule Class-12 » Chemistry-Papers

Molisch’s test reagent is

5% solution of α-Napthol in alcohol and few droplets of conc. H2SO4

1% of β-Napthol in alcohol

both

In iodine test of starch which colour of ppt had been observed

black

red

blue

Which of the following bases is not present in RNA?

Adenine

Cytosine

Thymine

Vitamin C must be supplied regularly in diet because

it is fat soluble hence stored in the body and cannot be used on regular basis

it is water soluble hence used by the body on daily basis and is to be supplied regularly

it is water soluble hence excreted in urine and can’t be stored in the body

Deficiency of vitamin E causes

Scurvy

Muscular weakness

Sterility Anaemia

Reduction of hexose A (molecular formula C6H12O6) with sodium borohydride gives compound B and C. Compound B is optically inactive, whereas compound C is optically active . Which of the following is compound A?

D-glucose

D-fructose

D-mannose

D-galactose

Fructose reduce Tollen’s reagent due to

secondary alcoholic group

enolisation of fructose followed by conversion of aldehyde by base

primary alcoholic group

Find out the correct option among the following statements.

Maltose and lactose are non-reducing sugar

All monosaccharides whether aldoses or ketoses are reducing sugar

Fehling’s solution and Tollen’s reagent are non-reducing sugar

In reducing sugars, aldehydic and ketone group are free bonded

How many number of water molecules are removed from the n number of amino acids during the formation of peptide bond?

(n – 3)

(n – 1)

(n – 2)

Which of the following is the correct statement?

Amylose is not a component of starch

Proteins are composed of only one type of amino acid

Starch is a polymer of α-glucose

Biuret test is used for

Sugar

Proteins

Fats

Identify the pair of epimers

D-glucose and L-glucose

D-glucose and D-mannose

D-glucose and D-fructose

D-glucose and D-mannose

Carbohydrates have

> C = O group

–OH group

–CHO group

All

Millon’s test is given by

Proteins

Sucrose

ester

Select the base which is not common in DNA and RNA.

Cytosine (C)

Adenine (A)

Uracil (U)

Guanine (B)

Which carbohydrate is used in silvering of mirror?

(A) Sucrose

(D) B and C

(B) Fructose

Phosphodiester linkage is present between which carbon atoms of pentose sugars of nucleotides?

3’ and 3’

5’ and 5’

5’ and 3’

1’ and 5’

Which is a fat soluble vitamin?

Vitamin B6

Vitamin C

Vitamin A

Which one of the following is non-reducing sugar?

Glucose

Maltose

Sucrose

Fructose

Fehling’s solution test is given by

all of these

fructose

lactose

glucose

D-Glucose and L-Glucose are

epimers

anomers

enantiomers

diastereomers

What will be the sequence of complimentary strand of DNA if the one strand of DNA has the sequence of TATGACTG?

ATACACTC

ATACTGAC

ATACTGCA

Which of the following vitamins is water soluble?

Vitamin E

Vitamin D

Riboflavin

Osazone formation involves only 2 carbon atoms of glucose because of

reduction

chelation

oxidation

hydrolysis

Which one of the following is reducing sugar?

Fructose

Glycogen

Starch

Cellulose

Carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone.

Monosaccharide

Polysaccharide

Oligosaccharide

Glucose cannot be classified as ?

Aldose

Hexose

Oligosaccharide

Carbohydrate

The pair of compounds in which both the compounds give positive test with Tollen’s reagent is

fructose and sucrose

glucose and sucrose

glucose and fructose

Guanine is an example of

a nitrogenous base

a nucleoside

a nucleotide

The two monosaccharide units obtained on hydrolysis of disaccharide may be

same

both

different

Which of the following statements is not correct?

In alpha-amino acids, - NH2 and – COOH groups are attached to different carbon atoms.

Except glycine, all other amino acids show optical activity

Natural proteins are commonly made up of L-isomer of amino acids (D) In -amino acids, - NH2 and

Vitamin A is present in-

milk